問題文全文(内容文)：
変数変換(極座標)
$x=rcosθ$ $y=rsinθ$
$∬_D f(x,y)dxdy=∬_D f(rcosθ,rsinθ)rdrdθ$
(1)$∬_D \sqrt{x^2+y^2}dxdy$
$D : 4 \leqq x^2+y^2 \leqq 9$
(2)$∬_D sin\sqrt{x^2+y^2}dxdy$
$D : x^2+y^2 \leqq x^2$
変数変換(極座標)
$x=rcosθ$ $y=rsinθ$
$∬_D f(x,y)dxdy=∬_D f(rcosθ,rsinθ)rdrdθ$
(1)$∬_D \sqrt{x^2+y^2}dxdy$
$D : 4 \leqq x^2+y^2 \leqq 9$
(2)$∬_D sin\sqrt{x^2+y^2}dxdy$
$D : x^2+y^2 \leqq x^2$
単元：
Warning: usort() expects parameter 1 to be array, bool given in /home/kaiketsudb/kaiketsu-db.net/public_html/wp-content/themes/lightning-child-sample/single.php on line 102
Warning: Invalid argument supplied for foreach() in /home/kaiketsudb/kaiketsu-db.net/public_html/wp-content/themes/lightning-child-sample/single.php on line 103
Warning: usort() expects parameter 1 to be array, bool given in /home/kaiketsudb/kaiketsu-db.net/public_html/wp-content/themes/lightning-child-sample/single.php on line 102
Warning: Invalid argument supplied for foreach() in /home/kaiketsudb/kaiketsu-db.net/public_html/wp-content/themes/lightning-child-sample/single.php on line 103
指導講師：
ますただ
問題文全文(内容文)：
変数変換(極座標)
$x=rcosθ$ $y=rsinθ$
$∬_D f(x,y)dxdy=∬_D f(rcosθ,rsinθ)rdrdθ$
(1)$∬_D \sqrt{x^2+y^2}dxdy$
$D : 4 \leqq x^2+y^2 \leqq 9$
(2)$∬_D sin\sqrt{x^2+y^2}dxdy$
$D : x^2+y^2 \leqq x^2$
変数変換(極座標)
$x=rcosθ$ $y=rsinθ$
$∬_D f(x,y)dxdy=∬_D f(rcosθ,rsinθ)rdrdθ$
(1)$∬_D \sqrt{x^2+y^2}dxdy$
$D : 4 \leqq x^2+y^2 \leqq 9$
(2)$∬_D sin\sqrt{x^2+y^2}dxdy$
$D : x^2+y^2 \leqq x^2$
投稿日：2020.11.04